We spent the day at Lava Beds National Monument hiking through the lava tubes, which are natural cave like tunnels underground created by the flow of lava from a volcano. At the Visitor Center we bought bump helmets (which came in VERY handy because Josephine bumped her helmet covered head 3 times within 15 minutes underground). The park rangers also loaned us flashlights for our underground adventure. This was our first caving trip and we had a lot of fun. If traveling through this area, we would recommend a stop at this monument.